[4] On 26 April, Larsen made his debut with the senior team in a cup match, where he scored a hat trick in a 10-1 win against Drøbak-Frogn IL.

[citation needed] Larsen signed for La Liga club Celta in August 2022 for a transfer fee of €11 million.

[13][14] On July 2, 2024, Larsen signed for Premier League club Wolverhampton Wanderers on an initial loan deal with a €30 million obligation to buy.

[citation needed] Larsen played for the Norway under-17 national team at the 2017 UEFA European Under-17 Championship, in which he scored a goal against the Netherlands in a 2–2 draw in the group stage.

[citation needed] In November 2020, Larsen received his first call-up to the Norwegian senior team,[16] debuting against Austria.